Export to excel on button click of C# code

Question

Hello,
          I want to develop an application in C# with authentication , after viewing all the pages, if the user clicks the more button or select a radio button, his information such as user name , and other information
must be appended to an excel sheet (office 2003 or 2007 excel sheet). The person associated with the admin can then view the excel sheet in offline mode to view the details of all the people who opted for a particular option. There may be overlapping of the
time when person clicks the button and admin is viewing the excel sheet. Is there a namespace or library in C# to perform this.
Thanks
Regards
Anoop

Answer 1

The simplest way is this no need of Interoperablety  packages
private void toExcel()
Response.Clear();
Response.Buffer = true;
//Response.Charset = "UTF-8";
Response.AppendHeader("Content-Disposition", "attachment;filename=schoolsinfo.xls");
Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
Response.ContentType = "application/ms-excel";
this.EnableViewState = false;
System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("EN-US", true);
System.IO.StringWriter oStringWriter = new System.IO.StringWriter(myCItrad);
System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
GridView1.RenderControl(oHtmlTextWriter);
Response.Write(oStringWriter.ToString());
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